A cat with a mass of 5 kg sits on a branch that is 26 m off the ground. What is its gravitational potential energy? The acceleration of gravity is 9.8 m/s2

A. 872 J
B. 1274 J
C. 638 J
D. 244 J

Henry, whose mass is 95 kg, stands on a bathroom scale in an elevator. the scale reads 830 n for the first 2.4 s after the elevator starts moving, then 930 n for the next 2.4 s. part a what is the elevator's speed 4.8 s after starting? express your answer with the appropriate units.